Ejector mechanism for casting machines



May 14, 1929. c. L. LEE ET AL 1,712,961

EJECTOR MECHANISM FOR CASTING MACHINES Filed De c. 3, 1927 2 Sheets-5heet 1 L g'rvuzntow 747,71 967 I n 179a)? 4& aka 1. {a

May 14, 1929. c, LEE ET AL 1,712,961

EJEGTOR MECHANISM FOR CASTING MACHINES 2 Sheets-Sheet 2 Filed Dec. 3, 1927 Patented May 14, 1929.

UlTED STATES PATENTOFFICE.

CHARLES 311. LEE, OF DAYTON, OHIO, AND THOMAS C. VAN DEGRIFUZ, U13 LUIlE'lFROIT,

MICHIGAN, ASSIGNORS TO GENERAL MOTORS} REEJ'EARCH COlEtIPOfi-A'ICION, OF DE- TRUIT, MIGHIGAN, A CORPORATION OF DELAWARE.

EJIECTOR IVIECHANISIVI FOR CASTING MACHINEEEL Application filed December 3, 1927.

This invention relates to casting apparatus in which partible permanent molds are utilized.

The object of the invention is to insure the separation or ejecting of the hot casting from the mold at the proper time during the act of parting the mold sections after the casting has set The invention consists of an improvement in ejector mechanism for casting apparatus of the general. type disclosed in an application of G. L. Lee and T. G. Van Degrift, filed l-lpril 22, 1925, Ser. No 24,968.

ln the accompanying drawing in which like reference characters indicate like parts throughout the several views:

lTig. l is a side elevation of so much of a casting apparatus as is necessary to illustrate the structure and mode of operation of the improved ejector mechanism;

llig. A is anelevation, partly in cross sec tion on the line 22 of Fig.- 1, showing the baclr of one mold section carrier and an ejector operating mechanism;

liig. 3 is a side elevation of an ejector and an operating lever to which it is attached, and

Fig. 4-. represents an ejcctorrod viewed from above.

Referring to the drawing; 10 indicates a base upon which the casting elements comprising the mold sections, carriers and associated mechanism therefor are mounted. This base may rest upon the floor of the foundry or may be mounted upon a travelling turret orother travelling mechanism forming part of an automatic casting ma chine.

Resting upon the base 10 is a platform 11 which is preferably yieldingly supported as by the springs 12. On top of the platform 11 is a machined surface 13, upon which the movable mold sections to be hereafter described may rest when the mold sections are closed and upon which they may slide during the initial portion of their opening or parting movement. At opposite ends of the platform 11, as viewed in Fig. 1, there are tip-standing stop members 14 adapted to engage with cooperating abutments 14 above them which, in the present case, form parts of a cam plate 29 rigidly bolted to the base 10 as hereafter d=scribed.

Two partible mold sections 15 are removably secured, as by locking studs 15 and Serial No. 2237,!h0.

pins 16, to two mold section carriers 16, each carrier being pivoted by pintle. rod 17 to a lever arm 18 fulcrumed at 19 to an elevated member 20 rising from the base 10. Only one lever arm 18 is shown in Fig. 1 of the drawmg; it is not shown in .lFig. 2 in order that the structure of the mold carrier may not be obscured. llt will be understood. that similar arm is, in practice, mounted on the opposite end of the base and operates the other mold. carrier and mold. 'lhe baclr of each mold is provided with flanges 21 having machined surfaces 22 which contact with similar machined surfaces 23 on the carriers. .[tir spaces exist between the inner surfaces of the carriers and the backs of the molds in order to facilitate cooling the molds. blpatter plates protect the joints of the apparatus from drops of molten metal which may separate from the stream being poured into the gate. The pouring gate in the mold. shown is within the projecting portions 25.

The molds are separated from each other after a casting has set, by rocking the lever arms 18 about the fulcrums 19, carrying the pivotal centers at 17 in an are having the fulcrum pin 19 as a center. llt is desired to separate the mold sections during the first portions of their nirting movements without changing their angular relation. to each other, thus maintaining their meeting faces substantially parallel inordcr that there may be no n'larring of the casting due to relative angular movements. After the molds have separated a reasonable extent, say two or more inches, dependent uponv the size of the casting it is desired to rock the molds so that when they are fully open, their meet- .ing faces will include an angle say of from 10150 degrees, thus rendering it easy to rcmove the casting and presenting the molding surfaces in convenient position to be sooted or otltierwise coated. In order to effect the desired control of the movements of the molds there is provided on each mold carrier 1.6 an arm 26 preferably carrying at its end a stud or roller 27 projecting laterally from the arm and engaging a cam groove 28 formed in a cam plate Each cam plate 529 has a pendent lug 30 by which it is bolted or riveted to a flange 31 on the inner side of the member 20. 'llhusa the cam plates are rigid with'the base 10. The cam grooves 28 are so designed that as the lever arm 18 rocks to part the mold sections, the sections separate with their faces parallel and then rock, com ing to rest ultimately in the position indicated by dotted lines in Fig. 1. Both cam plates 29 are identical in form but are re versed in position so that the cam plate for controlling one mold carrier has the cam groove 28 on the opposite side from that of the cam plate controlling the movements of the opposite mold carrier.

Each mold is provided with one orifice, or several, through which one or several rod-like ejectors may be pushed for the purpose of detaching the casting should it adhere to either of the mold sections. Each mold of the illustrated embodiment should be provided with two ejectors; but as the mechanism is identical for each section, 1t is shown onlyapplied to one of them. The ends of these ejectors remain flush with the molding surface when the molds are closed and also in the early portion of the parting movement,

- ejector is produced by the cooperation of the cam groove in the cam plate 29 formed in that face of the plate which is opposite the 'cam groove 28 which, as described, cooperates with an arm on the mold carrier for the purpose of controlling the angular posia shank 35 extending from a hinge end 36.

The shank 35 of each ejector slides through an a propriate opening in the mold carrier 16w ile the head 23 is guided in appropriate orifices formed through the mold.

lever 18 is connected. tween two members 38'formed onthe back The means for operating the ejectors comprises a lever 37 fulcrumed on the pintle rod 17 to which also the work end of operating This rod extends beof the mold carrier. The end of the lower arm of lever 37 carries a lateral stud or roller 39 which is in engagement with a cam groove 40 in cam plate 29 on the side opposite that containing the described groove 28. Between the fulcrum of the lever on red 17 and said stud or roller 39, hinge member 36 of ejector 33 is pivoted by means of pin 11. As shown in Figure 2, lever 37 is adapted to operate two ejectorrods. To this end the work arm of said lever is of general U-form, the limbs being journalled on pintle rod 17. Two parallel cars 42 are provided on each limb, between which the hinge members 36 of p the several ejectors are confined and tl'irough ing arm bearing the stud or roller 39 depends, as clearly shown in Fig. 2, this arm being oil-set toward the center of the U-mcmbcr for the purpose of clearing the ejector connections and for cooperating with the groove 40 in cam plate 29. The oriiiee 13 for pin 41 in hinge portion 36 of ejector 33 is preterably elongated transversely of the pin to compensate for the arcuate movement of ejector lever 37 with respect to the mold section, in which the ejector operates.

In operation the mold sections will first separate with a substantiall parallel move ment so that the hot casting formed therein may not be marred by a relative angular opening of the mold parts. During this movement the ends of the ejector rods rcmain flush with the mold surface. The ejector rods retain this relative position for a brief period due to the design of the cam which is such that during the early opening movement the stud or roller 35) is caused to move by the cam groove 40 so as to retain the ejectors statimmry with respect to the mold face. 'lhereafter, when the stud or roller 39 enters the straight portion of the cam groove 40, lever 37 is caused to rock inward with respect to the mold carrier so as to project the inner ends of the ejector rods and detach the casting from the mold section. The casting is likely to cling to one or the other of the mold sections and it is neressary to have ejectors operating through each. The operation is certain, positive and gentle. The hot casting will not be marred by any violent action of the ejectors.

lVe claim:

1. Casting apparatus comprising a base; a partible mold consisting of cooperating mold sections; a mold section carrier; an ejector movable with said carrier for detaching the casting; means for movably attaching said ejector to said mold. carrier and means on the base cooperating with the ejector for actuating it rendered eli'ective by the parting movement of the molds.

2. Means as defined in claim 1, in which a cam rigid with the base cooperates with the ejector during parting of the molds.

3. Casting apparatus comprising a base; a partible mold consisting of mold sections; mold section carriers; a cam plate on the base having cams on opposite sides; an arm on a mold section. carrier engaging the cam on one side of the cam plate; an ejector movably related to the mold and mold section carrier, and means attached to the ejector entulci-nmed on said mold section carrier and connected to the e ector; and a cam on the base Cooperating with said lever to operate carrier to which the ejectors are connected. 1

said lever having two work arms and a power arm, and a cam fixed to the base in position to cooperate with said work arm and control the movements of the ejectors.

In testimony whereof we aflix signatures.

CHARLES L. LEE. THOMAS C. VAN DEGRIFT. 

